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Do you see that little "lightening bolt" icon just under the histogram?
That is indicating that you are viewing a photo that was edited in an earlier Lightroom Process Version.
Hover your mouse over this icon- it will probably say "Process 2010" and it may give you an option to update the image to Process Version 2012 (Current)
You can also select the Process Version in the Camera Calibration panel of the develop module.
This feature allows Lightroom to be compatible with all edits from previous versions of Lightroom, and Lightroom changes the appearance of the sliders to look like the previous version.
When you upgrade a photo to the Current Version 2012 you may see the colors of your edits change very slightly.
but it is recommended to do all 'work' in the current 2012 version, as the develop 'engine' does a better job than previous versions.
Oh! and to answer your question- the Dehaze will only appear when you upgrade the photo to Process Version 2012 current!
That's it! Thanks so much!
I have Lightroom CC. I'm having the same problem with the dehaze slider not in the adjustment brushes. It says I'm in the 2012 current version too??
What is the exact version of Lightroom CC that is installed on your computer?
I don't recall the exact version when the sliders were added. However, the current version is 2015.5. You need to update. Here is the link you can go to if the creative cloud application manager doesn't indicate an up date:
The brushes and filters that you are looking for were not in the early releases of Lightroom CC 2015.